gaugetrykk

Gaugetrykk, or gauge pressure, is the pressure indicated by a pressure gauge relative to the surrounding atmospheric pressure. It is a common measure in engineering, manufacturing, automotive work, and everyday equipment because it reflects the pressure difference that drives processes or loads. The gauge reading P_g represents how much pressure the system has above or below ambient air. The relationship to absolute pressure P_abs and atmospheric pressure P_atm is P_g = P_abs - P_atm. At sea level, P_atm is about 101,325 pascals, so a gauge reading of 1 bar (100 kPa) corresponds to an absolute pressure of about 2 bar.

Instruments for gaugetrykk include Bourdon-tube gauges, diaphragm and capsule gauges, and modern digital gauges. The sensing element deflects or deforms in proportion to the pressure difference between the process side and the atmosphere, and the device converts that deflection into a readable display. Gauges can be mechanical (analogue or digital) or electronic.

Common units for gaugetrykk are pascals, kilopascals, bars, and pounds per square inch. Positive readings indicate pressure above ambient; negative readings (vacuum) indicate lower than ambient pressure. Typical applications include tire pressure monitoring, hydraulic and pneumatic systems, water supply and HVAC, and industrial process control. It is important to distinguish gaugetrykk from absolute pressure, which is measured relative to a perfect vacuum, and from differential pressure, which measures the pressure difference between two process points.